ASPHALT PAVEMENTS FOR ROAD VEHICLES: UPDATING OF STRUCTURAL DESIGN PROPOSALS WITH SPECIAL REFERENCE TO THE INFLUENCE OF HIGH TEMPERATURES

THE AUTHORS DESCRIBE A RE-EXAMINATION OF ASPHALT ROAD DESIGN THAT THEY HAVE MADE IN THE LIGHT OF RECENT DEVELOPMENT WORK THAT HAS BEEN CARRIED OUT IN THE NETHERLANDS AND FRANCE. THIS WORK HAS CONFIRMED THAT THERE IS GOOD AGREEMENT BETWEEN DESIGN BASED ON ELASTIC THEORY AND PERFORMANCE AT NORMAL TEMPERATURES (ABOUT 20 DEGREES C), AND THAT ACCEPTABLE RESULTS ARE OBTAINED OVER A RANGE OF TEMPERATURES UP TO 60 DEGREES C PROVIDED THE PROPERTIES OF THE ASPHALT LAYER ARE EXPRESSED AS A STIFFNESS MODULUS MAKING ALLOWANCE FOR THE INFLUENCE OF TEMPERATURE AND THE TIME OF LOADING. DETAILS ARE GIVEN OF A BASIS FOR PAVEMENT DESIGN WHICH INCLUDES CALCULATION OF THE MODULUS OF SUBGRADE AND UNBOUND LAYERS THE PERMISSABLE SUBGRADE AND ASPHALT STRAINS AND THE DESIGN LOAD. THIS IS FOLLOWED BY AN ACCOUNT OF THE INFLUENCE OF TEMPERATURE ON THE MODULUS OF THE MATERIALS AND OF TEMPERATURE VARIATIONS THAT OCCUR IN DIFFERENT COUNTRIES. THE AUTHORS GIVE EXAMPLES OF DESIGN CURVES THAT HAVE BEEN BASED ON THESE CONCEPTS AND DATA. THESE AND LIMITED PRACTICAL EXPERIENCE, SUGGEST THAT THE PRESENT THICKNESSES OF CONSTRUCTION MAY BE RATHER CONSERVATIVE IN ALL BUT HIGH TEMPERATURE REGIONS, WHERE A RATHER GREATER THICKNESS MAY BE REQUIRED. THE ARTICLE CONCLUDES WITH A DISCUSSION OF THE PROBLEM OF PERMANENT DEFORMATION.

• Corporate Authors:

  IPC Building and Contract Journals Limited

  32 Southwark Bridge Road
  London SE1 9EX,   England 
• Authors:
  • Edwards, J M
  • Valkering, C P
• Publication Date: 1974-2

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 4-9
• Serial:
  • Highways and Road Construction
  • Volume: 42
  • Issue Number: 1770

Subject/Index Terms

• TRT Terms: Asphalt pavements; Bituminous pavements; Deformation; Design load; Explosives; Flexible pavements; Pavement design; Pavement subgrade; Pavements; Specifications; Structural design; Temperature; Thickness
• Uncontrolled Terms: Pavement thickness
• Old TRIS Terms: Asphalt pavement specifications
• Subject Areas: Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00081715
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: A
• Files: ITRD, TRIS
• Created Date: Feb 27 1975 12:00AM